Usually aluminum in 150 Shan, stainless steel in 310 Shan that is lost the original performance, and titanium alloy in 500-600 Shan to maintain good mechanical properties, when the plane reaches Mach 2.7, the plane's structural surface temperature reaches 230 Shan, the aluminum alloy and magnesium alloy can not be used, and the titanium alloy is able to meet the requirements, the heat resistance of titanium, it is used for aero-engine compressor plate and blade and the fuselage after the skin of the aircraft.